1994-006377 - septic system - Laserfiche WebLink

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• . •\ • I11Mi' LLECriQhjpRL1Ea '\., Detrsrntne pump eapadtyi . • I. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of . • water use rate. 2. Maximum suggested for delivery to a drop box of a home system is 2.700 gallons per hour(45 gpm) to prevent build-up of pressure in drop box. 3. Use value from design of pressure distribution System. 6•0 P_ -(>7..4--,. .,„;..,3_,. 7�;,,, 3_ SELECTHD PUMP CAPACITY spat i MP.lay+tdt I B. Determine head regniremettstt Pob, i. Elevation difference between pump and point of dlecharge. Mis•rallott bt!lt7c fo feet 2. if pumping to a pressure distribution system,add Ave feet for pressure fo oYt- required at manifold . • feet P-1 Iib ' 3. Friction loss 1.3 inch 2_0 inch 3.0 a. Enter friction loss table with gpm and pipe diameter. h'�'�""*'10°n 1 r,. . Read friction loss in feet per 100 feet from page F-18. • 10 0.69 0.20- F.L - a.Y/ ft./100 ft of pipe •14 o.9s 0.28 ' ' b. Determine total pipe length from pump to discharge 16 1.63 0.48 • point. Add 25 percent to pipe length for fitting iia 203 0.60 loss,or use a fitting loss chart. Equlvalentpipe 20 2_47 0.73 0.1 21 3.73 1.11. 0.1 length- 1.25 times pipe length• 30 313 1.33 0.2 • l x 1.25•• "".5"--- feet 3� 7.90 2_06 0.3 c. Calculate total friction loss by multiplying 45 11.0f .C2� 0.3 friction loss in ft/100 R !valent length. 0 14.73 3.28 0.4, i ! � pipe gt 50 3.99 OS ( Total friction loss. '7 x a7.(0 +100■ '• d feet 55 • 4.76 0.7( 4. Total head required is the suof elevation difference, S.6d O.S re special head requirements,and total friction loss. - 6 ,+ 5.0_4 ,7. o . 5 (1) (2) (3c) .. ;• • TOTAL HEAD __I,_3m • ,:_feat • ' C. Pump selection 1. A pump must be selected to deliver at least gpm (Slep•A) with at least b-7 / 1 feet of total head (Step B). ttmwrm mom rums at #3141.OPt1 rt � rye( a rttstoa+ct• D. Total Pumpout Volume , emioor� goo rt ls b 1 ' 1. To maximize pump Ilfe select sump size for 4 to 5 pump operations per day. a , Soo ata • Goo :aped 4.4 • /50 gallons per dose s Mo :IX, x1-4 2. Calculate drainback I 1.30 9 r »> r • toxo - eoo 3 T . 1. Determine total pipe length, too ,feet. , . I !too ars 104 • 2. Determine liquid volume of pipe,17:‘,/ gallops per 100 feet. (see page F-1e) - F-1 8d 3. Multiply length by volume: Drainback quantity . CII5IMCoo feet x /7,41 gallons/tt70 ft. /0 gallons. - � o'er' • - It. I •Suggested drainback quantity Is 10 percent of pumped quantity. A larger dralnbadt 1.25 7.77 percentage will decrease pump station e(flciency slightly but pumping energy costs w usually a relatively small pert of the total household energy costs. • 1.5 E '- ",:73. Total ump out volume equals dose volume+drainbacl 2.5 24.8-, / oo alloys per dose+ /o gallons• I G d Total Callow 3 38.4 4 66.1